Areas of Severe Thunderstorms and Heat This Weekend

Severe thunderstorms today may produce damaging winds, large hail, tornadoes, and flooding over parts of the Plains into the Missouri Valley. On Sunday, scattered severe thunderstorms capable of damaging wind gusts are expected across the Mid-Atlantic vicinity. Hazardous heat will continue in the South, Southwest and central California this weekend building across the Pacific Northwest Sunday. Read More >

Current conditions at

San Marcos, San Marcos Municipal Airport (KHYI)

Lat: 29.89°NLon: 97.86°WElev: 597ft.

Partly Cloudy

91°F

33°C

Humidity	56%
Wind Speed	S 13 mph
Barometer	29.97 in (1014.1 mb)
Dewpoint	73°F (23°C)
Visibility	8.00 mi
Heat Index	100°F (38°C)
Last update	13 Jun 1:56 pm CDT

More Information:

Local Forecast Office More Local Wx 3 Day History Hourly Weather Forecast

Extended Forecast for

4 Miles SW San Marcos TX

This Afternoon
High: 92 °F
Chance
T-storms
Tonight
Low: 76 °F
Chance
T-storms then
Mostly Cloudy
Sunday
High: 90 °F
Slight Chance
Showers then
Showers
Likely
Sunday Night
Low: 74 °F
Chance
T-storms then
Showers
Likely
Monday
High: 85 °F
Showers
Monday Night
Low: 73 °F
Showers
Tuesday
High: 85 °F
Showers
Likely
Tuesday Night
Low: 73 °F
Slight Chance
T-storms
Wednesday
High: 89 °F
Mostly Cloudy
then Slight
Chance
T-storms

Detailed Forecast

This Afternoon

A slight chance of showers, then a chance of showers and thunderstorms after 4pm. Mostly sunny, with a high near 92. Heat index values as high as 101. South southeast wind around 10 mph, with gusts as high as 20 mph. Chance of precipitation is 30%.

Tonight

A 30 percent chance of showers and thunderstorms before 7pm. Partly cloudy, with a low around 76. South southeast wind 5 to 15 mph, with gusts as high as 20 mph.

Sunday

Showers likely and possibly a thunderstorm, mainly after 1pm. Partly sunny, with a high near 90. Heat index values as high as 100. Southeast wind around 5 mph. Chance of precipitation is 60%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.

Sunday Night

A chance of showers and thunderstorms before 10pm, then a chance of showers between 10pm and 4am, then showers likely and possibly a thunderstorm after 4am. Mostly cloudy, with a low around 74. Southeast wind 5 to 10 mph. Chance of precipitation is 60%.

Monday

Showers and possibly a thunderstorm. High near 85. East southeast wind around 5 mph. Chance of precipitation is 90%.

Monday Night

Showers and possibly a thunderstorm. Low around 73. East northeast wind around 5 mph. Chance of precipitation is 80%.

Tuesday

Showers likely and possibly a thunderstorm before 1pm, then a chance of showers and thunderstorms after 1pm. Mostly cloudy, with a high near 85. East northeast wind around 5 mph. Chance of precipitation is 70%.

Tuesday Night

A 20 percent chance of showers and thunderstorms before 1am. Mostly cloudy, with a low around 73. Southeast wind around 5 mph becoming calm in the evening.

Wednesday

A 20 percent chance of showers and thunderstorms after 1pm. Partly sunny, with a high near 89. South wind 5 to 10 mph, with gusts as high as 20 mph.

Wednesday Night

Partly cloudy, with a low around 76.

Thursday

A 20 percent chance of showers and thunderstorms. Partly sunny, with a high near 92.

Thursday Night

A 30 percent chance of showers and thunderstorms. Partly cloudy, with a low around 77.

Juneteenth

A 30 percent chance of showers and thunderstorms. Partly sunny, with a high near 91.